restoring migratory fish habitat dam safety considerations
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NYS Department of Environmental Conservation
by John Stawski
NYS Dam Safety Permit RequirementsNYS Dam Safety Permit Requirements
Basic components of a Dam and how they functionBasic components of a Dam and how they function
To Have a better Understanding of:To Have a better Understanding of:
The decision making process involved inThe decision making process involved in
Dam Removals and Aquatic Passage at DamsDam Removals and Aquatic Passage at Dams
Restoring Migratory Fish HabitatRestoring Migratory Fish Habitat
Dam Safety ConsiderationsDam Safety Considerations
Workshop ObjectiveWorkshop Objective
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NYS Department of Environmental Conservation
Is Dam Removal an Option?Is Dam Removal an Option?
Issues to Consider:Issues to Consider:
-- EcologicalEcological
-- EconomicEconomic
-- SocialSocial
-- Technical/EngineeringTechnical/Engineering TodaysTodays
FocusFocus
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Is Dam Removal an Option?Is Dam Removal an Option?
Issue Considered:Issue Considered:-- Technical/EngineeringTechnical/Engineering
-- Feasibility of Repairing andFeasibility of Repairing andMaintaining a DamMaintaining a Dam
-- Feasibility and Design ofFeasibility and Design of
Dam RemovalDam Removal
-- Feasibility of providing Aquatic PassageFeasibility of providing Aquatic Passage
over or around the Damover or around the Dam
FocusFocus
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NYS Department of Environmental Conservation
Common Dam Types in the Hudson ValleyEmbankment DamsEmbankment Dams
Earthen Embankment Dams aremade up of compacted earth usuallyobtained from a source near the
dam.The dam sides are banked toprovide a stable slope.
They are permeable and are
sometimes constructed in zoneswith a concrete or clay core.
Concrete and MasonryConcrete and Masonry
gravity damsgravity dams
They rely on their own weight tohold them in place and are referredto as gravity dams
Masonry and concrete are moreor less impermeable.
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EXAMPLE DAMEXAMPLE DAM
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NYS Department of Environmental Conservation
Avoid DamAvoid Dam
Modify DamModify Dam
PassagePassage
StrategyStrategyDam SafetyDam Safety
Concern?Concern?
YesYes
MaybeMaybe
FocusFocus
-- Feasibility of providing Aquatic PassageFeasibility of providing Aquatic Passage
over or around the Damover or around the Dam
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Photos and schematic courtesy of the USGSPhotos and schematic courtesy of the USGS
Eel PassageEel Passage
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Approach Too ShallowApproach Too Shallow
Too HighToo High
Too littleToo little
flowflowToo FastToo Fast
Too SmallToo Small
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NYS Department of Environmental Conservation
EnergyEnergy DissipatorsDissipators
Auxiliary SpillwayAuxiliary SpillwayPrimary Spillway and lowPrimary Spillway and low
level drainlevel drain
Can the Existing Dam Provide Aquatic Passage?Can the Existing Dam Provide Aquatic Passage?
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NYS Department of Environmental Conservation
HighervelocityShootingflow
HighervelocityShootingflow
Lower velocity flowLower velocity flow
EXAMPLE DAMEXAMPLE DAM
How a grass lined auxiliary Spillway worksHow a grass lined auxiliary Spillway works
Assess: Auxiliary Spillways potentialAssess: Auxiliary Spillways potential
For Passage ?For Passage ?
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EXAMPLE DAMEXAMPLE DAM
Strategy:Strategy: Use a portion of the Spillway to install a stepped passageUse a portion of the Spillway to install a stepped passagefor the trip up stream.for the trip up stream.
Safety Concern:Safety Concern: If the passage significantly decreases spillwayIf the passage significantly decreases spillwaycapacity, the dam may overcapacity, the dam may over--top during a storm.top during a storm.
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NYS Department of Environmental Conservation
How an In line Spillway works.How an In line Spillway works.
Assess:Assess: Primary spillwaysPrimary spillways
potential For Fish Passage ?potential For Fish Passage ?
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NYS Department of Environmental Conservation
EXAMPLE DAMEXAMPLE DAM
How a Drop Box Low Level Drain WorksHow a Drop Box Low Level Drain Works
Primary Spillways potential for fish passage ?Primary Spillways potential for fish passage ?
Plunge Pool EnergyPlunge Pool Energy DissipatorDissipator
Remove boards and drain the pondRemove boards and drain the pond
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EXAMPLE DAMEXAMPLE DAM
Another Strategy:Another Strategy: Install a new culvert through theInstall a new culvert through theembankment that is large enough to install velocity refugesembankment that is large enough to install velocity refugesin the bottomin the bottom
Safety Concern:Safety Concern: If the soil isnt compacted properly around theIf the soil isnt compacted properly around thenew culvert soil may pipe and fail the damnew culvert soil may pipe and fail the dam
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NYS Department of Environmental Conservation
6 NYCRR Part 673
In 1999 ECL Section 15-0507 was amended and the
thresholds for requiring a dam safety permit
changed
Part 673, the current regulations are being changed
to reflect the new thresholds regarding height and
volume impounded by a dam.
Will a Dam Safety Permit beWill a Dam Safety Permit be
Required?Required?
FIRST QUESTIONFIRST QUESTION
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NYS Department of Environmental Conservation
Answer:
YES, therefore a NYS Dam SafetyPermit is required if proposed
work goes beyond maintenance
Is the Dam above Volume and
Height Thresholds?
XX
XXXX
FIRST QUESTIONFIRST QUESTION
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NYS Department of Environmental Conservation
SECOND QUESTIONSECOND QUESTION
Does the proposed construction go beyondmaintenance?
Or
Could improper construction lead to dam failure?
DAM SAFETY PERMIT PROCESSDAM SAFETY PERMIT PROCESS
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NYS Department of Environmental Conservation
6 NYCRR Part 608.66 NYCRR Part 608.6
Application form with Supplemental D-1 attached. FormD-1 lists critical information regarding the dam
A design report along with construction documents (i.e.plans and specifications) prepared by or under thedirection of a NYS licensed Professional Engineer.
If a Permit is Required:You need to submit a complete
Application and wait for a permit.
DAM SAFETY PERMIT PROCESSDAM SAFETY PERMIT PROCESS
DAM SAFETY PERMIT PROCESSDAM SAFETY PERMIT PROCESS
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NYS Department of Environmental Conservation
The Engineer will provide a final design inThe Engineer will provide a final design in
accordance with good engineering practice thataccordance with good engineering practice that
considers New York State guidelines for the designconsiders New York State guidelines for the design
of damsof dams
DAM SAFETY PERMIT PROCESSDAM SAFETY PERMIT PROCESS
Addressed in Guidelines
Hazard Classification
Hydrologic Analysis
Hydraulic Design
Outlet works and Conduits
Subsurface investigation
Structural Stability
D i G id liDesign G idelines
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NYS Department of Environmental Conservation
a. Hazard Classificationb. Hydrologic Analysis
c. Hydraulic Design
d. Outlet works and Conduits
e. Subsurface investigation
f. Structural Stability
g. Subsurface Investigation
Design GuidelinesDesign Guidelines
Assess the degree ofAssess the degree of
hazard failure, of thehazard failure, of the
dam, poses to downdam, poses to down
stream infrastream infra--structurestructureand populationand population
The procedure used to assessThe procedure used to assess
Hazard Class assumes that theHazard Class assumes that the
dam will fail .dam will fail .
The dams height and impounded volume determinesThe dams height and impounded volume determines
how big the initial flood wave is when the Dam failshow big the initial flood wave is when the Dam fails
suddenly.suddenly.
Design G idelinesDesign Guidelines
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NYS Department of Environmental Conservation
NYSNYS Class AClass A
Low HazardLow HazardPotential damage to:Potential damage to:
isolated farmisolated farm
buildingsbuildings undeveloped landundeveloped land
township or countytownship or county
roadsroads
NYSNYS Class CClass C
High HazardHigh Hazard
Potential:Potential:
loss of lifeloss of life
damage todamage to
main highwaysmain highways
railroadsrailroads
important utilitiesimportant utilities
Potential damage to:Potential damage to:
homeshomes
main highwaysmain highways
minor railroadsminor railroads
relatively importantrelatively important
utilitiesutilities
NYSNYS Class BClass B
IntermediateIntermediate
HazardHazard
NOTE: Hazards can changeNOTE: Hazards can change
Design GuidelinesDesign GuidelinesMoreMoreFactsFacts::
Dam Safety Permitting Process
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NYS Department of Environmental Conservation
Dam Safety Permitting Process
Permit for the Construction, Reconstruction, Removalor Repair of a Dam
Project Schedule
Design
Bid
ConstructOperate
HazardC
lassificatio
n
Form
D-1and
TechnicalReview
FinalSubmittaland
PermitApproval
Inspectionand
Approvalto
Fill
maybe
required
IdentifyD
eficiencies
&
Remed
ialOptions
Inspectio
nby
Const.En
gineer
Engineers
Cert.&
As-builtDocs
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NYS Department of Environmental Conservation
Is Dam Removal anIs Dam Removal an
Option?Option?
-- Feasibility of RepairingFeasibility of Repairing
and Maintaining a Damand Maintaining a Dam
-- Feasibility and DesignFeasibility and Design
of Dam Removalof Dam Removal
-- Feasibility of providing AquaticFeasibility of providing Aquatic
Passage over or around the DamPassage over or around the Dam
FocusFocus
Technical/EngineeringTechnical/Engineering
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NYS Department of Environmental Conservation
-- Technical/EngineeringTechnical/Engineering
-- B. Feasibility and Design of Dam RemovalB. Feasibility and Design of Dam RemovalB1. Obtaining Dam Removal PermitsB1. Obtaining Dam Removal Permits
B2. Protecting Against Environmental ImpactsB2. Protecting Against Environmental ImpactsB3. Managing SedimentB3. Managing Sediment
B4. Removing StructuresB4. Removing StructuresB5. Protecting Infrastructure.B5. Protecting Infrastructure.
B6. Restoring the ChannelB6. Restoring the ChannelB7. Restoring Recovered LandB7. Restoring Recovered Land
FocusFocusNYS DAM SAFETY PERMITNYS DAM SAFETY PERMIT
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NYS Department of Environmental Conservation
a. Hazard Classification
b. Hydrologic Analysis
c. Hydraulic Design
d. Outlet works and
Conduits
e. Subsurface investigation
f. Structural Stability
Factors that influence Hydrology
Watershed Geometry
Size, Shape, Storage
Hydrologic Characteristics
Soils, Slopes, Cover Type, Land use
Curve Number, Time of Concentration
Rainfall- Depth, Intensity, Duration
Routing Stage vs Discharge
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NYS Department of Environmental ConservationHurricane Floyd1999 September 14 20:29 UT1999 September 14 20:29 UTNOAANOAA--14 satellite14 satellite
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Example DamExample Dam
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NYS Department of Environmental Conservation
TROPICAL STORM TAMMY OCTOBER 2005TROPICAL STORM TAMMY OCTOBER 2005
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NYS Department of Environmental Conservation
Addressed in Guidelines
Hazard Classification
Hydrologic Analysis
Hydraulic Design
Outlet works and Conduits
Subsurface investigation
Structural Stability
FocusFocus
FocusFocus
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Stability of the Structure as it is being deStability of the Structure as it is being de--constructed and afterconstructed and after
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NYS Department of Environmental Conservation
Stability of the Structure as it is being deStability of the Structure as it is being de--constructed and afterconstructed and after
Hydraulic capacity of the finished channel to pass a design storHydraulic capacity of the finished channel to pass a design stormm
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Hydraulic capacity of the finished channel to pass a design storHydraulic capacity of the finished channel to pass a design stormm
Emergency AuthorizationEmergency Authorization
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NYS Department of Environmental Conservation
g yg y
THE ENDTHE ENDXX dingE ding
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NYS Department of Environmental Conservation
THE ENDTHE END
I Made it !!!!I Made it !!!!
XX
HappyEndi
ng
HappyEndi
ng